Sieving screening and separating device



C. E. V. HALL SIEVING scnsaume'mv SEPARATING DEVICE July 15. 1924.

Filed Sept. 16 1922 2 Sheets-She. 1

INVENTOR Cl/HRLE-S E. 1 f/m.

ATTORNEYS 1 c. E. v. HALL SIEVINQ SCREEN ING AND SEPARATING DEVICE 2 Sheets-Sue 3 Filed Sept. 16, 1922 INVENTOR Cl/HRLES E .IK l/HLL a-zwt'n ATTORNEYS Patented July 15, 1924.

Fries.

CHARLES EDWARD VINCENT HALL, OF SHEFFIELD, ENGLAND.

SIEVING SCREENING AND SEPARATING DEVICE;

Application filed September 16, 1922. Serial No. 588,533.

into two or more parts of difierent degrees of fineness or size of particles.

The invention relates primarily to the treatment of materials which have been ground milled or otherwise disintegrated in the dry or natural state but by known means 20 terials in suspension in the liquid.

For the purpose of describing this invention the word screen refers to a perforated or non-perforated sheet or. the like.

compound sieve screen or the like of perforated plate or the like form-ed into a complete or truncated cone or pyramid receives the material to be graded on or near its apex, (which is disposed upwards) the surfaceof such a cone or the like is constructed so as to make an angle with the base of adegree which may vary according tothe nature of the material to be treated although an angle of thirty degrees is r in general found to be satisfactory. The screen or the frameworksupporting the same is itself supported by means of hinges, shackles,-

springs or the like flexible means giving either universal or restricted freedom of movement of the screen or screens except in so far as is'communicated thereto by cams or the like ona rotating shaft which cams give to the screen a horizontal and/or vertical movement or any combination J of these, such movement being preferably of the nature of a smart bl-ow which willcause the material lying on the screen to be mo-' mentarily-violently thrown out of contact with the screen. Disposed immediately below such-screen or sieve is a non-perforated plate or the like or may be a receptacle for receiving the material which passes through the sieve.

it may also be used for the treatment of ma- In carryingout the invention a simple or products into separate receivers.

Such plate or" the like may be o a o i al form with its apex -v wards and its base terminating immediately above a. second perforated screen with its base upwards, and the material which has passed through the first screen is thus distributed over the second screen which is of finer mesh. than the first for further treatment; the material which passes through the second screen may otherwise be received on or in a non-perforated plate or receptacle and diverted from the device.

Any material which does not fall through the first or top sieve is received around its base and may be there-diverted by known means to either a coarser screen situated lower in the device or alternatively to a receptacle outside the device; or in another modification on to a screen of similar mesh to the first thus increasing the capacity of the machine. All the screens in the device participate in the oscillating rocking shaking or the like movement above mentioned and the non-perforated division plates or the like may or may not be subjected to such vibration.

A supply hopper is mounted above the upper screen and an outlet from the hopper is disposed centrally over the apex of the upper sieve. The apex of this sieve either forms, or carries, or actuates a valve or the like device, which normally closes the outlet of the hopper or otherwise stops the supply and only allows the material to. fall, preferably in a cylindrical shower, when the screen or its framework is operated by the shaking device. j

The whole is preferably enclosed'in a dusttight casing through which outlet ducts are provided for the delivery of the graded Such outlet ducts terminate'at their upper ends immediately below the screens and non-perforate divisions and preferably without coming into contact with the same.

In a modification of the invention desiccation processes may be carried out on the material being treated and for this purpose heat is applied to the outer casing or heated gases or the like are introduced. into the dust-tight casing in known manner, and t "purpose reference is had. to two sheets of drawings h h warm r thi ifiecation. Similar reference-letters are used to refer to the same or similar parts in each of theviews.

Fig". I is ajcentra-l vertical section of a separating devicemade according to this invention.

Fig. II is a medial half section of a modified form of sieves and non-perforated dividing plates or collectors showing the ducts and delivery tubes. T

Fig. III is'a half medial section of another form of the invention.

" Fig. IV is a plan view of a screening surface made in the form of 'a hexagonal pyramid.

Fig. V is a detail and section of one section of the screen of Fig. IV.

Fig. VI shows in plan a method of varying the size of the aperture in a screen plate.

Fig. VII shows a section of the valve at the base of the hopper in Fig. I.

Referring to the drawings :In Fig. I, A represents a beam or the like for carrying the screening device (which is supported by brackets as B, and 13,) and also the rotating shaft C with the cam wheel I) and the pulley E the latter being shown dotted; F and F are brackets fixed to thecasing for supporting the sieves K and L and the nonperforated plates K and L =by means of the shackles hooks or the like H and II; J is a connecting rod or the like fixed to the sieve or sieves or the supports for the same and through the action of the cams or the like as shown on the wheel D communicating a shaking or the like movement to the sieves. Ibe connecting rod is preferably kept in close contact with the cams by means of spiral springs M as shown. G is a hopper with its outlet disposed centrally over the apex of the upper sieve K which apex is formed as or carries or acts as a valve normally closing the outlet. A dust-tight casing as S may enclose-the whole device and may also act as a duct and outlet as at M.

Referring to Fig. II. K, L, and M are sieves and K, L, and M are non-perforated divisions whilst L L M and 'M repre sen-t receivers with outlet ducts for. delivering the graded material outside the device. The course of any material being treated will be as follows :falling on the apex of thecon'ical sieve K and under the vibrating motion of the sieves due to the cams the material which is sufficiently fine will fall through the screen K on to the dividing plate K and will be delivered thereby to the sieve L. That part which is sufiiciently fine will pass through the sieve L and will be caught on the division plate L and be delivered thereby to the duct-L "any material which will not pass through the sieve L will arrive at the duct and outlet L Any terial wh ch s not sufficiently fine to pass through the first sieve K will be delivered to the sieve M and any which will not pass through this sieve to the duct and outlet NI is delivered by the duct and outlet M outside the device. It will be understood that with a device having three sieves of varied mesh and disposed as shown in the drawing four grades of material are obtained in varying degrees of fineness; the coarsest or tailings being discharged at the outlet M the next in order at the outlet M the next at L and the finest at L'.

It is preferable that, the receiving ducts as L L M and M are in no way attached to the vibrating sieves or the supports for the same.

Fig. III shows a half medial section of another form or arrangement of the device according to this invention and by means of which a disintegrated or the like material may be divided into two parts or grades only, that is :fine and tailings. In this figure K and L are sieves of similar mesh and K and L are non-perforated plates which divert the material which passes through the sieves K and L into receptacles and ducts K and L respectively and which ducts ultimately become common at K The tailings are discharged by the duct and 'outlet L By the use of such a device as this an increased area of sieve is obtained in a slightly larger casing.

Fig. IV shows a sieve made up of six divisions similar to the one division shown in Fig. V. Although it is possible to construct the sieves each in one piece it is sometimes desirable to make them up in sections and such sections are secured on or to frames by known means. In such cases the sieving material such as woven wire mesh for instance is stretched on spring wire frames-as V; or on trays or the like and soldered or otherwise attached thereto and further such segmental sieves may be provided with receiving boxes W as shown in section in Fig. V and such boxes are provided with outlet ducts which may deliver separately in any known manner from those ducts shown at the base of the device in Figs. 1, II, and III. The sieves may be made of any suitable materials such as perforated metalsheets, woven wire mesh, or textile materials and in one modification using perforated sheet metal sieves as shown in Fig. VI, provision is made for varying by known means-the degree of coincidence of the perforations in two contiguous sheets of similarly per-forated metal so as to vary the size of aperture through such a compound sieve.

Fig; VII shows in some detail an arrangement of the valve or the like in the base of the hopper. G is the hopper which is preferably made to be fitted and fixed t0 the cover or casing of the device by means of a ient.

' flange as U. bar or the like N is fixed on or to the hopper so as to form a bridge and has a central hole through which a spindle P passes freely and carries at its lower end a valve plate 0, such a plate serves to cover more or'less the outlet of the hopper when the device is not working but is moved into and out of contact with its seating by a part such as T of the sieve K due to the vibrating or other action or movement of the sieves. The spindle P carrying the valve is screwed where it passes through the bridge piece N and a locking device as R is provided so as to adjust the amount of opening I above the valve and thus govern the rate of supply of the material to the device. It will be understood that by known means such as levers or the like the valve 0 can be operated from any distant point as may be'conven- It is a fact that sieves conically arranged and operated as herein described will give a product such that the tailings from any mesh of sieve contains an amount of material which would pass through that sieve if it were placed and operated horizontally. The desirable feature of this fact is that a fine grade of product can be obtained by the use of a coarser sieve than would otherwise be necessary and such a coarser sieve is in general more durable and less expensive than the finer sieve. As a concrete example it can be said that of the material which would pass through a sieve of eighty mesh fitted as herein described there would be ninety to ninety-five per cent which would pass through a sieve of one hundred mesh.

The method of operation has been already sufliciently described.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed I declare that what I claim is 1 In a device for separating and grading grain, or other comminuted material, an outer casing, a vibrating member mounted within and suspended from said casing, said vibrating member consisting of a plurality of inclined foraminated plates arranged in spaced parallel planes, and along which the material falls by gravity, nonper-.

forated division plates mounted between said foraminated plates, a plurality of delivery ducts communicating with the spaces between said plates and terminating outside of said casing and means to subject said vibrating member to a combined horizontal and vertical vibratory oscillation.

2. In a device as set forth in claim 1 in which means are provided for changing the amount of the openings of said foraminated plates.

3. In a device as set forth in claim 1 in which the openings of said foraniinated plates are of different sizes to separate the material into grades of different fineness.

4. In a device as set forth in claim 1, in which a hopper is secured to the upper end of said casing to deliver the material to said distributing member, a valve member is mounted at the delivery end of said hopper and means are provided to connect said valve member to said vibrating member to oscillate therewith, whereby the contents of said hopper will be discharged alternately towards opposite sides thereof.

Signed at Sheflield in the county of York, and Kingdom of Great Britain this 27th day of July A. D. 1922.

CHARLES EDWARD VINCENTHALL. 

